Update to ReadMe.md in r-services folder

Author: negust-microsoft

samples/features/r-services/README.md

@@ -1,5 +1,10 @@
 # Samples for SQL Server R Services
 
+Go to the getting started tutorials to learn more about:
+[Predictive Modeling with R Services](http://aka.ms/sqldev/r) 
+[Customer Clustering with R Services](https://www.microsoft.com/en-us/sql-server/developer-get-started/rclustering) 
+
+
 [Telco Customer Churn](Telco Customer Churn)
 
 Telco Customer Churn sample using SQL Server R Services.